CSI Reporting Using SRS Usage Data for Full-Duplex Interference
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Solution Overview
Problem
Existing wireless communication systems face limitations in accurately reporting channel status due to the lack of usage information for sounding reference signal resource sets, particularly in scenarios involving cross-link interference, which affects the completeness and accuracy of channel state information reporting, especially in integrated access and backhaul networks.
Innovation Solution
A base station sends a CSI report configuration message to a UE, indicating the SRS resource set and its usage information, allowing the UE to determine the number of spatial layers of cross-link interference, and report channel status information based on this information, which is also applicable in integrated access and backhaul networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If usage information for SRS resource sets is not provided, then the system complexity is reduced, but the channel status reporting accuracy deteriorates
Solution Approach 1:
The base station acts as an intermediary that provides usage information for SRS resource sets to the UE. This intermediary communication enables the UE to accurately determine the number of spatial layers for CLI reporting without requiring the UE to independently complex analysis of interference sources, thus improving measurement precision while managing system complexity through centralized information provision.
Solution Approach 2:
The base station performs preliminary action by pre-configuring and providing usage information for SRS resource sets before the UE needs to report channel status. This advance provision of information allows the UE to immediately determine spatial layer configuration without performing complex real-time analysis, thereby improving reporting accuracy while minimizing the computational complexity at the UE side.
2Loss of information
If the UE determines spatial layers based on usage information, then the channel state information completeness is improved, but the processing complexity at UE increases
Solution Approach 1:
The UE performs self-service by autonomously determining the number of spatial layers based on the usage information provided by the base station. Instead of requiring complex network coordination or additional signaling, the UE uses the provided usage information (codebook-based or non-codebook-based) to independently calculate and report complete channel state information, thus improving information completeness while keeping UE processing complexity manageable through straightforward determination logic.
3Reliability
If SRS resource set usage information is provided, then the interference management effectiveness is improved, but the signaling overhead increases
Solution Approach 1:
The usage information for SRS resource sets serves multiple functions simultaneously: it enables the UE to determine spatial layers for CLI reporting, provides interference management guidance, and supports channel status reporting. This multi-functionality means that a single signaling element achieves multiple objectives, improving interference management effectiveness while minimizing additional signaling overhead by reusing existing SRS resource set configurations.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. An integrated access and backhaul (IAB) node may receive, from a parent IAB node, a channel state information (CSI) report configuration for generation of a CSI report associated with monitoring, by the IAB node, at least one CSI-reference signal (CSI-RS) resource set, the configuration also indicating usage information for the at least one CSI-RS resource set. The IAB node may transmit a CSI resource configuration to a downstream node, the CSI resource configuration indicating, based at least in part on the usage information, a number of spatial layers of cross-link interference associated with the parent IAB node. The IAB node may receive, from the downstream node, the CSI report indicating CSI, the CSI associated with the cross-link interference based at least in part on the number of spatial layers.